scope:

This standard provides requirements for the construction and testing of electrical apparatus, or parts of such apparatus, whose circuits are incapable of causing ignition in:

Classes I, II & III, Division 1 hazardous (classified) locations as defined in Article 500 of the National Electrical Code®, ANSI/NFPA-70 (NEC®).

This standard is intended to be used in conjunction with FM Approvals Standard 3600, Electrical Equipment for Use in Hazardous (Classified) Locations - General Requirements, which includes the general requirements that apply to all types of classified location protection methods.

Purpose

This standard states testing and certification requirements for intrinsically safe apparatus and associated apparatus.

Testing and certification criteria may include, but are not limited to, performance requirements, marking requirements, examination of manufacturing facility(ies), audit of quality assurance procedures, and a surveillance program.